Seat-spider.



-No. 693,825. v v H. W. BOLENS.

A SEAT SPIDER.

A piic-cionfiled. 1m. 14, 1901.

' Patented Feb 25, I902.

(N0 Model.)

.INE uonms PETER! 00.. micro-Lima. wqsnmm'qu, n, c.

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UNITED STATES PATENT OFFICE.

HARRY W. BOLENS, OF PORT WASHINGTON, WVISOONSIN.

SEAT-SPIDER.

SPECIFICATION forming part of Letters Patent No. 693,825, dated February25, 1902. Application filed March 14, 1901. Serial No. 61j093| (N0model.)

To on whom it may corwrm Be it known that I, HARRY W. BoLENs, a citizenof the United States, and a resident of Port Washington, in the countyof Ozaukee and State of Wisconsin, have invented certain new and usefulImprovements in Seat-Spiders; and I do hereby declare that the followingis a full, clear, and exact description thereof.

My invention has for its object to provide the chair and stool tradewith economical spiders of the kind comprising sheet-metal arms madefast to spreaders and attachable at their ends to seats, said inventionconsisting in certain peculiarities of construction and combination ofparts hereinafter particularly set forth with reference to theaccompanying drawings and subsequently claimed.

Figure 1 of the drawings represents a partlysectional side elevation ofa tilt-seat spider made in accordance with my invention; Fig. 2, atransverse sectional view of the spider, this View being indicated bylines 2 2 in the third figure; and Fig. 8, a plan view of said spiderinverted and partly in horizontal section.

Referring by letter to the drawings, A indicates a transverse spreader,and B each of a pair of parallel arms made independent of each other andthe spreader, but fastened to said spreader in practice, this assemblageof parts constituting a seat-spider in accordance with my invention.

The spreader herein shown is a one-piece casting; but I do not wish tobe understood as limiting myself to a cast-metal spreader, as it may beotherwise in some instances.

Each of the arms 13 is of sheet-steel, semitubular or inverted-U shapein cross-section for the greater portion of its length, and is hereinshown supported upon and approximating in shape in cross-section ashoulder 19 of the spreader, to which it is made fast, this shouldercofistituting the outer wall of a transverse spreader-groove 0. Each armB is also horizontal for a portion of its length and is bent to have itsends at a greater elevation than the remainder thereof, these ends beingflattened and apertured for the engagement of bolts or rivets by whichthey are held snug against the under side of a seat, it being preferableto die-shape said ends of the arm, so as to form countersinks d for theheads of fastening devices, this construction being herein shown.

Depending from the outer wall of each arm B and integral therewith is apivot-ear e of the spider. The pivot-ears herein set forth take theplaces of those that have heretofore been formed as a part of or securedto the spreader portion of aspider. The spider-arms and pivot-ears beingof sheet-steel and integral with each other, as above specified, theywill withstand blows, vibrations, and other causes detrimental to castmetal counterparts.

The spreader-shoulders b are herein shown highest and thickest at theirends to thereby avoid necessity of dressing said shoulders throughouttheir length to insure smootholose fit of the arms B thereon, rivets fbeing also herein shown as means for fastening said arms to theaforesaid shoulders.

The spreader A is shown provided with supporting-lugs g for spiraltension-springs commonly employed in conjunction with tiltseat spiders,and the end shoulders I) of said spreader preferably are extended beyondthe edges of the spreader, the latter being intersected by play-slots hfor stop-ears of an ordinary tilt-seat standard.

While the spider herein shown and particularly described is especiallydesigned for tilt-seat chairs, my invention in some of its d etails isapplicable to other varieties of chairs and to various kinds of stools,it being practical to vary the structural details of said spider in someparticulars, according to its utility in the chair and stool trade,without departure from the essential characteristics of said invention.

It is to be noticed that the preferably spider arms B are flattenedWhere they are riveted to the spreader, this flattening being done inorder that full round and clean holes for the engagement of the rivetsor equivalent fastening devices may be punchedin the metal, no bursbeing left to make uneven contact with the spreader.

Having thus described my invention, what I claim as new, and desiretosecure by Letters Patent, is

1. A seat-spider comprising a spreader, a pair of sheet-metal armscurved in cross-sew tion having integral depending pivot-ears, and meansby which the arms are fastened to said spreader.

2. A seat-spider comprising a cast-metal spreader, a pair of sheet-metalarms curved in cross-section having integral depending pivot-ears, andmeans by which the arms are fastened to said spreader.

3. A seat-spider comprising a spreader the body portion of which isprovided with transverse grooves and end shoulders, sheet-metal andsemitubular arms fast on the spreadershoulders and engaging the grooves,and

pivot-ears depending from the arms.

4. A seat-spider comprising a spreader the body portion of which isprovided with playslots for stop-ears of a tilt-seat standard,transverse shoulders at the ends of the body portion and intermediategrooves, said end shoulders constituting outer walls of the grooves;sheet-metal spider-arms fast on the spreader-shoulders and having theirinner edges resting within the grooves, and pivotears depending from thearms.

5. A spider-arm forchair-spiders, said arm semitubular in cross-sectionand approximating and mounted on the said shoulders.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in

the county of Milwaukee and State of Wisconsin, in the presence oftwowitnesses.

HARRY W. BOLENS.

\Vitnesses:

N. E. OLIPHANT, B. O. ROLOFF.

